/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#include "sessiondialog.h"
#include "../browser.h"
#include "../util.h"
#include "sessionform.h"
#include "ui_sessiondialog.h"
#include "ui_sessionform.h"
#include <QFile>
#include <QFileDialog>
#include <QToolButton>
#include <QStyle>
#include "configuration.h"

SessionDialog::SessionDialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::SessionDialog)
{
    ui->setupUi(this);
    ui->open->setIcon(style()->standardIcon(QStyle::SP_DirOpenIcon));

    auto *browser = qobject_cast<Browser *>(qApp);
    Q_CHECK_PTR(browser);

    Configuration conf;
    for(const QString &path : Util::files(conf.value<QString>("session.path").value(), { "*.json" })) {
        addItem(path);
    }

    ui->listWidget->addItem(tr("Create a new window"));

    connect(ui->listWidget, &QListWidget::currentItemChanged, this, [this](QListWidgetItem *currentItem, QListWidgetItem *previousItem) {
        auto *currentWidget = qobject_cast<SessionForm *>(ui->listWidget->itemWidget(currentItem));
        if(currentWidget != nullptr)
            currentWidget->ui->delete_toolButton->show();

        auto *previousWidget = qobject_cast<SessionForm *>(ui->listWidget->itemWidget(previousItem));
        if(previousWidget != nullptr)
            previousWidget->ui->delete_toolButton->hide();
    });

    connect(ui->open, &QPushButton::clicked, this, [this]() {
        const QString filename = QFileDialog::getOpenFileName(this, tr("Select Session file"), QDir::homePath(), tr("JSON (*.json)"));
        if(!filename.isEmpty()) {
            ui->listWidget->setCurrentItem(addItem(filename));
            accept();
        }
    });

    accepted_connection = connect(this, &SessionDialog::accepted, this, [this, browser]() {
        auto *currentWidget = qobject_cast<SessionForm *>(ui->listWidget->itemWidget(ui->listWidget->currentItem()));
        if(currentWidget != nullptr)
            this->openSession(currentWidget->ui->label->text());
        else
            browser->createWindow();
    });

    connect(ui->search, &QLineEdit::textEdited, this, &SessionDialog::search);
}

SessionDialog::~SessionDialog()
{
    delete ui;
}

std::optional<QJsonObject> SessionDialog::pickSession()
{
    disconnect(accepted_connection);

    if(this->exec() == QDialog::Rejected) {
        return std::nullopt;
    }

    auto *currentWidget = qobject_cast<SessionForm *>(ui->listWidget->itemWidget(ui->listWidget->currentItem()));
    if(currentWidget != nullptr) {
        QFile json(currentWidget->ui->label->text());
        if(json.open(QIODevice::ReadOnly | QIODevice::Text)) {
            auto doc = QJsonDocument::fromJson(json.readAll());
            return doc.object();
        }
    }

    return std::nullopt;
}

QListWidgetItem *SessionDialog::addItem(const QString &path)
{
    auto *item = new QListWidgetItem(ui->listWidget);
    auto *widget = new SessionForm(path, this);
    connect(widget->ui->delete_toolButton, &QToolButton::clicked, this, [item, widget]() {
        delete item;
        delete widget;
    });
    ui->listWidget->setItemWidget(item, widget);
    return item;
}

void SessionDialog::search(const QString &text)
{
    for(int i = 0; i < ui->listWidget->count(); ++i) {
        auto *item = ui->listWidget->item(i);
        auto *widget = qobject_cast<SessionForm *>(ui->listWidget->itemWidget(item));

        if(widget == nullptr)
            item->setHidden(!text.isEmpty());
        else
            item->setHidden(!widget->ui->label->text().contains(text));
    }
}

void SessionDialog::openSession(const QString &filename)
{
    auto *browser = qobject_cast<Browser *>(qApp);
    Q_CHECK_PTR(browser);

    QFile json(filename);
    if(json.open(QIODevice::ReadOnly | QIODevice::Text)) {
        auto doc = QJsonDocument::fromJson(json.readAll());
        Session::restoreSession(doc.object());
        json.close();
    }
}